The Netherlands, as a nation-state, dates to 1568, when the Dutch Revolt created the Dutch Empire. Previously, the Germanic tribes had no written language during the ancient and early medieval periods, so what we know about their early military history comes from accounts written in Latin and from archaeology. This causes significant gaps in the historic timeline. Germanic wars against the Romans are fairly well documented from the Roman perspective; however, Germanic wars against the early Celts remain mysterious because neither side recorded the events. Wars between the Germanic tribes in Northern Belgium and the present day Netherlands, and various Celtic tribes that bordered their lands, are likely due to their geographical proximity.
Belgium, a country with a Dutch-speaking majority, became an independent state in 1830 when it seceded from the Netherlands. Despite the contemporary political boundaries, they share much of the same military history.
Germanic tribes are thought to have originated during the Nordic Bronze Age in northern Germany and southern Scandinavia. The tribes spread south, possibly motivated by the deteriorating climate of that area. They crossed the River Elbe, most likely overrunning territories formerly occupied by Celtic people. In the East, other tribes, such as Goths, Rugians and Vandals, settled along the shores of the Baltic Sea pushing southward and eventually settling as far away as Ukraine. The Angles and Saxons migrated to England. The Germanic peoples often had unsettled relationships with their neighbours and each other, leading to a period of over two millennia of military conflict over various territorial, religious, ideological and economic issues.